I would prefer they not pursue the mother of Wonder Woman angle.
Since the prequel comic is canon, I see no reason why not to use the character; it would allow DC to expand its cinematic mythology, without having all of the pressure on the Superman films.
"Johnny Storm's a good-hearted kid, sure, but he has the attention span of a toaster, and he leads with his face; in Johnny's undisciplined mind, there's only a single synapse between thinking and doing. The Avengers' battle cry is "Avengers Assemble"; the Fantastic Four's is "Johnny, WAIT!"----Mark Waid